Compensation type sealing device in butterfly valve

Abstract

The utility model provides a compensation type sealing device in a butterfly valve, which comprises a butterfly valve main body, an upper control piece, a sealing bearing and a sealing ring, and a lower connecting flange used for being connected with the upper control piece is arranged at the upper end of the inner composition of the butterfly valve main body. The butterfly valve has the advantages that the butterfly valve body, the upper control piece, the sealing bearing and the sealing ring are additionally arranged, the sealing ring is embedded into the sealing ring groove, the sealing ring is embedded into the sealing ring groove to press the sealing ring, and the upper connecting flange and the lower connecting flange are fixed through the bolt. The valve rod rotates to extrude the main sealing ring and transmit the extruded air to the inflatable sealing ring, so that the air in the main sealing ring is extruded out and guided into the air bag through the air pipe, the size of the air bag is increased, the size of the inflatable sealing ring is reduced, abrasion of rotation of the valve rod to the main sealing ring is reduced, and therefore sealing compensation can be conducted, and the sealing effect is improved. The liquid can be guided into the liquid storage tank and an alarm can be given when the liquid leaks.

Description

Technical Field

[0001] The utility model belongs to the technical field of butterfly valves, and in particular relates to a compensating sealing device in a butterfly valve. Background Art

[0002] The butterfly valve is a commonly used fluid control device, mainly used to regulate and block the flow of fluid. It is characterized by a simple structure, small fluid resistance and good sealing performance. In use, the butterfly valve may involve frequent switching control of its on and off depending on the use scenario, which requires the valve stem to be rotated frequently. The rotation of the valve stem will increase the wear of the sealing ring installed in conjunction with it, which will cause the sealing performance of the butterfly valve to decrease rapidly. Most common butterfly valves are not equipped with corresponding compensating sealing structures. This may cause the butterfly valve to leak slowly due to the wear of the sealing ring during use, affecting the transportation and use of the liquid. Some liquids will cause the butterfly valve to be dirty and cannot be used for subsequent disassembly and assembly. In addition, especially when dealing with harmful, flammable or high-temperature media, leakage not only endangers personnel safety, but may also cause fires, explosions and other accidents. If the leaked medium is chemical substances or sewage, it may pollute the surrounding environment and violate environmental protection regulations.

[0003] In summary, the butterfly valve has insufficient sealing performance and there are some problems in use, so it is hoped to propose a new structure to solve the above technical problems. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a compensating sealing device in a butterfly valve to solve the problems raised in the above-mentioned background technology.

[0005] The utility model is realized through the following technical solutions: a compensating sealing device in a butterfly valve, comprising: a butterfly valve body, an upper operating member, a sealing bearing and a sealing ring, the upper end of the internal component of the butterfly valve body is provided with a lower connecting flange for connecting with the upper operating member, the outer periphery of the upper surface of the lower connecting flange is provided with a sealing ring groove for improving the connection sealing, a sealing ring is installed on the inner side of the sealing ring groove, a control column is provided below the lower connecting flange, a sealing bearing for assisting the rotation of the valve stem is installed on the inner side of the control column, a valve stem is provided through the middle of the sealing bearing, the outer side of the lower end of the internal component of the butterfly valve body is provided with a butterfly valve housing, an inner side of the right upper end of the butterfly valve housing is provided with an inner cavity, and an air bag for assisting the compensating seal is provided inside the inner cavity.

[0006] As a preferred embodiment, a bearing sealing ring is provided below the sealed bearing, a bearing seat is provided below the bearing sealing ring, a fixing ring is movably connected below the bearing seat and outside the valve stem, and a main sealing ring is movably installed outside the fixing ring.

[0007] As a preferred embodiment, an inflatable sealing ring for compensatory sealing is provided on the outside of the main sealing ring. The inflatable sealing ring and the airbag are connected by an air tube and the two ends of the air tube are respectively connected to the inflatable sealing ring and the airbag, so that the airbag can control the increase and decrease of the gas inside the inflatable sealing ring, realize the volume control of the inflatable sealing ring, and thereby reduce the wear of the main sealing ring.

[0008] As a preferred embodiment, the lower end of the internal component of the upper operating member is provided with an upper connecting flange, and a sealing ring is fixedly connected to the lower surface of the upper connecting flange. The sealing ring and the sealing ring groove are interlocked to press the sealing ring.

[0009] As a preferred embodiment, a control seat for controlling the rotation of the valve stem is provided above the upper connecting flange, the upper connecting flange and the lower connecting flange are fixed by bolts, the sealing ring is embedded in the sealing ring groove, and the sealing ring is embedded in the sealing ring groove to squeeze the sealing ring, and the upper connecting flange and the lower connecting flange are connected and fixed with bolts, which can improve the sealing after connection.

[0010] As a preferred embodiment, a groove for liquid drainage is provided on the inner periphery of the upper surface of the sealing ring groove, a group of downflow holes is provided below the groove, and a group of diversion holes for diverting the liquid is provided below the downflow holes.

[0011] As a preferred embodiment, a liquid storage tank for receiving overflowed liquid is fixedly connected to the upper left outer side of the butterfly valve housing. The liquid storage tank is communicated with the diversion hole. A liquid sensor is provided on the inside of the liquid storage tank, which can lead liquid into the liquid storage tank and sound an alarm when liquid leaks.

[0012] After adopting the above technical scheme, the beneficial effects of the utility model are as follows: by adding a butterfly valve body, an upper control part, a sealing bearing and a sealing ring, the sealing ring is embedded in the sealing ring groove, so that the sealing ring is embedded in the sealing ring groove to press the sealing ring, and the upper connecting flange and the lower connecting flange are fixed with bolts. The rotation of the valve stem will squeeze the main sealing ring and transmit it to the inflatable sealing ring, so that the internal gas is squeezed out and introduced into the airbag through the trachea. The volume of the airbag increases and the volume of the inflatable sealing ring decreases, reducing the wear of the main sealing ring caused by the rotation of the valve stem, and the inflatable sealing ring can be inflated through the airbag when the valve stem is fixed, so that its volume increases and squeezes the main seal, thereby enabling sealing compensation to improve the sealing effect. By adding a butterfly valve body, it can be introduced into the liquid storage tank and an alarm can be issued when the liquid leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0014] Figure 1 The utility model is a schematic diagram of the overall structure of a compensating sealing device in a butterfly valve.

[0015] Figure 2 The utility model is a schematic structural diagram of a compensating sealing device in a butterfly valve without the upper operating member.

[0016] Figure 3 This is a structural schematic diagram of a butterfly valve body in a compensating sealing device in a butterfly valve of the utility model.

[0017] Figure 4 The utility model is a cross-sectional schematic diagram of a butterfly valve body in a compensating sealing device in a butterfly valve.

[0018] Figure 5 The utility model is a schematic structural diagram of an upper control member in a compensating sealing device in a butterfly valve.

[0019] In the figure, 100-butterfly valve body, 101-butterfly valve housing, 102-control column, 103-lower connecting flange, 104-sealing ring groove, 105-groove, 106-downflow hole, 107-guide hole, 108-liquid storage tank, 109-valve stem, 110-fixing ring, 111-main sealing ring, 112-inflatable sealing ring, 113-airbag;

[0020] 200-upper control piece, 201-upper connecting flange, 202-sealing ring, 203-control seat;

[0021] 300-sealed bearings;

[0022] 400-Seal ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figures 1 to 5The present invention provides a technical solution: a compensating sealing device in a butterfly valve, comprising: a butterfly valve body 100, an upper operating member 200, a sealing bearing 300, and a sealing ring 400. The upper end of the butterfly valve body 100 is provided with a lower connecting flange 103 for connecting with the upper operating member 200;

[0025] A sealing ring groove 104 is provided on the outer periphery of the upper surface of the lower connecting flange 103 to improve the sealing performance of the connection. A sealing ring 400 is installed inside the sealing ring groove 104. A control column 102 is provided below the lower connecting flange 103.

[0026] A sealed bearing 300 is installed on the inner side of the control column 102 to assist the rotation of the valve stem 109. The valve stem 109 runs through the middle of the sealed bearing 300. The butterfly valve body 100 has a butterfly valve housing 101 on the outer side of the lower end thereof. An inner cavity is opened on the inner side of the upper right end of the butterfly valve housing 101, and an air bag 113 is provided on the inner side of the inner cavity to assist the compensation seal.

[0027] A bearing sealing ring is provided below the sealed bearing 300 , and a bearing seat is provided below the bearing sealing ring. A fixing ring 110 is movably connected to the outside of the valve stem 109 below the bearing seat, and a main sealing ring 111 is movably installed outside the fixing ring 110 .

[0028] An inflatable sealing ring 112 for compensatory sealing is provided on the outside of the main sealing ring 111. The inflatable sealing ring and the airbag 113 are connected by an air tube, and the two ends of the air tube are respectively connected to the inflatable sealing ring 112 and the airbag 113. The airbag 113 can control the increase or decrease of the internal gas of the inflatable sealing ring 112, thereby realizing volume control of the inflatable sealing ring 112 and reducing the wear of the main sealing ring 111.

[0029] The upper operating member 200 has an upper connecting flange 201 at its lower end. A sealing ring 202 is fixedly connected to the lower surface of the upper connecting flange 201 . The sealing ring 202 is engaged with the sealing ring groove 104 and presses the sealing ring 400 .

[0030] A control seat 203 for controlling the rotation of the valve stem 109 is provided above the upper connecting flange 201. The upper connecting flange 201 and the lower connecting flange 103 are fixed by bolts. The sealing ring 400 is embedded in the sealing ring groove 104, and the sealing ring 202 is embedded in the sealing ring groove 104 to squeeze the sealing ring 400. The upper connecting flange 201 and the lower connecting flange 103 are connected and fixed with bolts, which can improve the sealing after connection.

[0031] See also Figure 1-Figure 5As the first embodiment of the present utility model: First, the user embeds the sealing ring 400 into the sealing ring groove 104, and embeds the sealing ring 202 into the sealing ring groove 104 to squeeze the sealing ring 400, and uses bolts to connect and fix the upper connecting flange 201 and the lower connecting flange 103, which can improve the sealing after the connection. Secondly, the user can control the amount of gas inside the airbag 113 during the rotation of the valve stem 109, so that the air pipe connected to the inflatable sealing ring 112 and the airbag 113 at both ends respectively controls the amount of gas inside the inflatable sealing ring 112, and then controls the volume of the inflatable sealing ring 112, which can reduce the wear of the main sealing ring 111 when the valve stem 109 rotates, and can increase the inflation amount after the main sealing ring 111 is worn to perform supplementary sealing control, thereby performing sealing compensation to improve the sealing effect.

[0032] A groove 105 for liquid drainage is formed on the inner periphery of the upper surface of the sealing ring groove 104 , a group of downflow holes 106 are formed below the groove 105 , and a group of diversion holes 107 for diverting the liquid are formed below the downflow holes 106 .

[0033] A liquid storage tank 108 for collecting overflowed liquid is fixedly connected to the upper left outside of the butterfly valve housing 101. The liquid storage tank 108 is communicated with the guide hole 107. A liquid sensor is provided inside the liquid storage tank 108, which can guide liquid into the liquid storage tank 108 and sound an alarm when liquid leaks.

[0034] See also Figure 1-Figure 4 As the second embodiment of the present utility model: Based on the above-mentioned first embodiment, when the butterfly valve body 100 fails to seal and liquid leaks, the leaked liquid can be collected through the groove 105 and flow downward through the downflow hole 106, and then introduced into the inside of the liquid storage tank 108 through the guide hole 107. The liquid is sensed by the liquid sensor inside the liquid storage tank 108 and an alarm is issued in time, thereby reducing the problems caused by liquid leakage.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A compensating sealing device in a butterfly valve, comprising: A butterfly valve body (100), an upper operating member (200), a sealing bearing (300) and a sealing ring (400), characterized in that the upper end of the internal components of the butterfly valve body (100) is provided with a lower connecting flange (103) for connecting to the upper operating member (200); A sealing ring groove (104) for improving connection sealing is provided on the outer periphery of the upper surface of the lower connecting flange (103), a sealing ring (400) is installed inside the sealing ring groove (104), and a control column (102) is provided below the lower connecting flange (103); A sealing bearing (300) for assisting the rotation of the valve stem (109) is installed on the inner side of the control column (102), and the valve stem (109) is passed through the middle of the sealing bearing (300). The butterfly valve body (100) has a butterfly valve housing (101) on the outer side of the lower end thereof, and an inner cavity is opened on the inner side of the upper right end of the butterfly valve housing (101), and an air bag (113) for assisting the compensatory seal is provided on the inner side of the inner cavity.

2. A compensating sealing device in a butterfly valve according to claim 1, characterized in that: A bearing sealing ring is provided below the sealing bearing (300), a bearing seat is provided below the bearing sealing ring, a fixing ring (110) is movably connected below the bearing seat and outside the valve stem (109), and a main sealing ring (111) is movably installed outside the fixing ring (110).

3. A compensating sealing device in a butterfly valve according to claim 2, characterized in that: An inflatable sealing ring (112) for compensating sealing is provided on the outside of the main sealing ring (111). The inflatable sealing ring and the airbag (113) are connected via an air tube, and both ends of the air tube are in communication with the inflatable sealing ring (112) and the airbag (113).

4. A compensating sealing device in a butterfly valve according to claim 1, characterized in that: The upper operating member (200) has an upper connecting flange (201) at its lower end, and a sealing ring (202) is fixedly connected to the lower surface of the upper connecting flange (201). The sealing ring (202) and the sealing ring groove (104) are interlocked and press the sealing ring (400).

5. A compensating sealing device in a butterfly valve according to claim 4, characterized in that: A control seat (203) for controlling the rotation of the valve stem (109) is provided above the upper connecting flange (201), and the upper connecting flange (201) and the lower connecting flange (103) are fixed by bolt connection.

6. A compensating sealing device in a butterfly valve according to claim 1, characterized in that: A groove (105) for liquid drainage is provided on the inner periphery of the upper surface of the sealing ring groove (104), a group of downflow holes (106) is provided below the groove (105), and a group of diversion holes (107) for diverting the liquid is provided below the downflow holes (106).

7. A compensating sealing device in a butterfly valve according to claim 6, characterized in that: A liquid storage tank (108) for receiving overflowed liquid is fixedly connected to the upper left side of the outer side of the butterfly valve housing (101); the liquid storage tank (108) is communicated with the guide hole (107); and a liquid sensor is provided inside the liquid storage tank (108).

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